Inhomogeneous pseudogap phenomenon in the BCS-BEC crossover regime of a trapped superfluid Fermi gas

Ryota Watanabe, Shunji Tsuchiya, Yoji Ohashi

Research output: Contribution to journalArticle

Abstract

We investigate pseudogap phenomena in the unitarity limit of a trapped superfluid Fermi gas. Including effect of strong pairing fluctuations within a T-matrix approximation, as well as effects of a harmonic trap within the local density approximation (LDA), we calculate the local superfluid density of states below the superfluid phase transition temperature Tc. We show that the spatial region where single-particle excitations are dominated by the pseudogap may still exist even below Tc, due to inhomogeneous pairing fluctuations caused by the trap potential. From the temperature dependence of the pseudogapped density of states, we identify the pseudogap regime of the unitarity Fermi gas with respect to the temperature and spatial position. We also show that the combined T-matrix theory with the LDA can quantitatively explain the local pressure which was recently observed in the unitarity limit of a 6Li Fermi gas.

Original languageEnglish
Article number012080
JournalJournal of Physics: Conference Series
Volume400
Issue numberPART 1
DOIs
Publication statusPublished - 2012

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crossovers
gases
approximation
traps
matrix theory
transition temperature
harmonics
temperature dependence
excitation
temperature

ASJC Scopus subject areas

  • Physics and Astronomy(all)

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Inhomogeneous pseudogap phenomenon in the BCS-BEC crossover regime of a trapped superfluid Fermi gas. / Watanabe, Ryota; Tsuchiya, Shunji; Ohashi, Yoji.

In: Journal of Physics: Conference Series, Vol. 400, No. PART 1, 012080, 2012.

Research output: Contribution to journalArticle

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